i dunno, i mean its a cool thing to of done, but without the achievements there is no sort of recognition in doing it other than "i have done it" lol

With the achievements it also lets you link the fact that you have done it, and you get these achievement points, what they are for or do i have no idea, but atm it seems like they are going to affect only basic things like, title, tabards and mounts, only graphical things of the game, not statistical.